Eigenstrain modelling of residual stresses generated by laser
shock peening
Eigenstrain modelling of residual stresses generated by laser
shock peening
This paper presents an eigenstrain (misfit strain) model to predict the residual stresses (RS) generated by laser shock peening. The stresses generated in the workpiece due to propagation of the shock wave cause plastic deformation in the top layers of the specimen, and on relaxation the deformed material is loaded in compression by the surrounding undeformed material causing a RS field. In the present model the shock wave is first modelled as a dynamic pressure load in an explicit finite element (FE) model and the stabilised plastic strain distribution extracted from this analysis is incorporated as an eigenstrain distribution in a static FE model. The RS distribution generated by the original laser shock is obtained as the elastic response to the Eigenstrain.
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, David
63daaf71-e1e5-4d86-9ce9-586f82c4f12a
6 June 2011
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, David
63daaf71-e1e5-4d86-9ce9-586f82c4f12a
Achintha, Mithila and Nowell, David
(2011)
Eigenstrain modelling of residual stresses generated by laser
shock peening.
11th International Conference on the Mechanical Behavior of Materials, Milano, Italy.
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Conference or Workshop Item
(Paper)
Abstract
This paper presents an eigenstrain (misfit strain) model to predict the residual stresses (RS) generated by laser shock peening. The stresses generated in the workpiece due to propagation of the shock wave cause plastic deformation in the top layers of the specimen, and on relaxation the deformed material is loaded in compression by the surrounding undeformed material causing a RS field. In the present model the shock wave is first modelled as a dynamic pressure load in an explicit finite element (FE) model and the stabilised plastic strain distribution extracted from this analysis is incorporated as an eigenstrain distribution in a static FE model. The RS distribution generated by the original laser shock is obtained as the elastic response to the Eigenstrain.
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Published date: 6 June 2011
Venue - Dates:
11th International Conference on the Mechanical Behavior of Materials, Milano, Italy, 2011-06-05
Organisations:
Engineering Science Unit
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Local EPrints ID: 369127
URI: http://eprints.soton.ac.uk/id/eprint/369127
PURE UUID: f7ae47a7-e687-4a51-ac0b-6c309fb40b41
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Date deposited: 25 Sep 2014 13:49
Last modified: 27 Apr 2022 08:37
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Contributors
Author:
Mithila Achintha
Author:
David Nowell
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